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    <title>Document</title>
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    <script>
        /* 
          数组去重['离歌','年少有为','像风一样','离歌'];
          1.遍历数组
          2.判断当前元素是否存在新数组
          3.添加
        */

        var arr =['离歌','年少有为','像风一样','离歌'];
        var newArr=new Array();
        for(var i = 0;i<arr.length;i++){
            if(newArr.indexOf(arr[i])==-1){
                newArr.push(arr[i]);
            }
        }
        console.log(newArr);
    </script>
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